定时刷新css文件

/*
 *这段程序可以定时重新加载页面中所有link引入的css文件
 *params:pertime为每多少毫秒重新加载
 *
 */
function autorefreshcss(pertime){
    var links = document.getElementsByTagName("link");
    var auto = function(links){
        var linkslen = links.length;
        for(var i = 0; i < linkslen; i++){
            var perlink = links[i], prelinkhre = '';
            if(perlink.href.indexOf("?") == -1) {
                perlink.href += '?' + gettime();
            } else {
                prelinkhre = perlink.href.slice(0, perlink.href.lastIndexOf('?'));
                perlink.href = prelinkhre + '?' + gettime();
            }
        }
    }
    setInterval(function(){auto(links);}, pertime);
}
//获取时间戳
function gettime(){
    var time = new Date();
    return time.getTime();
}
//使用方式
window.onload = function(){
    autorefreshcss(1000);
}